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down that challenge no president has delivered a more lasting inaugural phrase. >> the energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it. and the glow from that fire can truly light the world. >> reporter: since george washington made the firsthand written inaugural address, it has been what newly elected or reelected presidents aspire to but few achieve. a spark that lights a fire in the minds of americans. those who stand the test of time have often come in times of great national crisis. when franklin roosevelt first took office in 1932, the nation had just begun the great depression. and roosevelt sought to reassure the psyche of a nation. >> let me affirm the belief that the only thing we have to fear is fear itself. nameless, unreasonable, unjustified terror which paralyzing needed effort to convert retreat into advance. this nation is asking for action and action now. >> reporter: for abraham lincoln the moment came at the end of his second inaugural address, an appeal to heal the nation split by four years of
high speed video like this discovering exactly the direction and energy of hits on helmets. yet brain injuries remain unpredictable. >> we don't really understand precisely when an injury happens and what the threshold is. >> reporter: researchers studied a hit at 140-miles-an- hour. but head rotation may be just as important. >> your brain essentially starts sloshing around and leads to sheering motion. we think that maybe part of the injury. >> it's not just helmet to helmet. this brutal hit in the chest in the seahawks game caused walker's concussion. the mouthpiece technology was offered to the nfl but the league turned it down. this week doctors revealed junior seau committed suicide after he suffered brain damage from repeated head injuries. pop warner, tens of thousands of hits to the head appear cumulative. >> these low level sub threshold injuries that happen throughout the time. that can put you at risk. they have difficult remembering things and being able to concentrate. their interactions with people become affected they become more angry and emotional at times. >> more
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